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[squeaking]
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[squeaking continues]
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[Uzo Aduba] There's something
magical about dolphins.
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They appear so friendly.
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Yet so otherworldly.
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[uplifting music plays]
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They're clearly intelligent.
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And agile.
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[uplifting music continues]
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But we've still barely glimpsed
beneath the surface.
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[uplifting music continues]
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Now we can immerse ourselves
in their world,
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we're discovering
just how sophisticated they are.
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[birds squawking]
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[uplifting music continues]
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And the deeper we look,
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the more like us they seem.
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[uplifting music swells]
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[music fades]
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[tranquil music plays]
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Born into a world
where he can't even breathe,
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a young Atlantic spotted dolphin
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has a lot to learn about surviving at sea.
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A good thing he has someone
to show him the way.
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[tranquil music continues]
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Mom.
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And a wider group of family and friends.
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[dolphins squeak]
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[tranquil music continues]
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They'll help teach him
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how to find food…
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and how to avoid danger.
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But dolphin society is complicated.
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The greatest challenge
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is learning how to fit in.
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[tranquil music continues]
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These warm, shallow waters
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are also home to another species.
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Bottlenose dolphins.
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This might seem the perfect place
for a mother to raise her newborn calf…
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but even here,
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life isn't easy.
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[tense music plays]
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They're being followed.
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[suspenseful music plays]
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A group of males,
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looking for a mate.
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[suspenseful music continues]
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They could attack the baby to get to Mom.
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[suspenseful music continues]
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[dolphins click]
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More dolphins join the chase.
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[tense music plays]
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Mom does all she can to protect her calf.
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[dramatic music plays]
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Eventually,
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she fights them off.
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[dolphins squeak]
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But her baby is nowhere to be seen.
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Alone, he stands little chance.
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[tranquil music plays]
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Reunited with Mom…
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and her allies,
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the calf a little wiser
in the ways of the world.
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But his lessons in becoming a dolphin
have only just begun.
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[uplifting music plays]
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Dolphins are air-breathing mammals,
like us.
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Their ancestors once lived on dry land,
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but 50 million years ago,
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they did something amazing.
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Left the land
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to enter a life aquatic.
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[uplifting music continues]
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While one branch of the family
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became huge, filter-feeding baleen whales…
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they turned into streamlined,
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quick-thinking predators.
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Today, over 40 species of dolphin
hunt the oceans of the world.
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[uplifting music continues]
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From tropical waters…
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to polar seas,
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and even in rivers
thousands of miles inland,
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wherever there is prey,
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there's a dolphin
with a clever way of catching it.
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[uplifting music crescendos]
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Orca are the largest members
of the family.
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They can grow nearly 30 feet long
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and weigh seven tons.
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Each needs to catch
over 100 lb. of food a day.
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[tranquil music plays]
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Not easy in the polar winter.
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Unless you know where to look.
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[tranquil music continues]
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During the coldest months,
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their favorite prey
shelters in protected fjords.
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[tranquil music continues]
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Herring.
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In their billions.
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[tranquil music swells]
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[tense music plays]
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Tracking down their exact location
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can be tricky.
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Catching them is even harder.
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[tense music continues]
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[squeaking]
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Led by an experienced female,
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the family pod home in on the vast shoal.
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As long as the herring keep formation,
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they're hard to single out.
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[tense music plays]
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But the orca have a plan.
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[tense music continues]
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[dolphins squeak]
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With pulsing calls,
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and by flashing their white bellies…
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they herd the herring into the shallows.
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[tense music continues]
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In the panic, the fish form
tighter and tighter shoals.
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[tense music continues]
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Until finally,
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the orca can strike.
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[tense music continues]
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[thudding]
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[thudding]
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Smashing their tail flukes
creates powerful pressure waves.
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-[thudding]
-[dolphins squeak]
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A barrage of knockout blows.
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[somber music plays]
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[thudding]
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[dolphin squeaks]
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Once the fish are stunned,
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the orca can eat at leisure.
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[dolphins squeal]
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[tranquil music plays]
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00:11:09,043 --> 00:11:13,297
Dolphins maximize their hunting success
by working as a team.
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And out in the open ocean,
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they operate on an epic scale.
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[dramatic music plays]
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A stampede of spinner dolphins.
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A super pod over a thousand strong.
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[dramatic music continues]
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They make such an effective hunting force,
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they can afford plenty of downtime.
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Two hundred miles east of Brazil,
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this archipelago is a favorite stop-off
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for Atlantic spinner dolphins.
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They head for the island's shallow bays.
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The first arrivals are in high spirits.
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[uplifting music plays]
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The Olympic gymnasts
of the dolphin family.
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They can leap ten feet
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and spin seven times.
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[uplifting music continues]
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It looks a lot of fun.
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00:13:15,044 --> 00:13:18,214
But it's thought
there's more to these acrobatics.
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[uplifting music crescendos]
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Perhaps they're communicating,
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greeting other dolphins entering the bay.
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[dolphins squeak]
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[tranquil music plays]
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With safety in numbers,
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the spinners can relax.
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[tranquil music continues]
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But they can't switch off completely,
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or they would drown.
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So they shut down
one side of their brain at a time…
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with one eye on where they're going.
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Sleep swimming at half speed.
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[tranquil music continues]
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While older dolphins rest,
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the younger ones play.
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[tranquil music plays]
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[jaunty music plays]
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A game of seaweed catch.
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[jaunty music continues]
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It seems simple enough.
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[jaunty music continues]
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But this is
surprisingly sophisticated play.
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Manipulating objects,
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copying moves and, most importantly,
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understanding each other.
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A skill every young dolphin
must master as it grows.
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By a year old,
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an Atlantic spotted calf
is almost fluent in dolphin.
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00:16:09,969 --> 00:16:11,971
[tranquil music plays]
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00:16:14,348 --> 00:16:16,392
[dolphins click and squeak]
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00:16:16,475 --> 00:16:18,811
[tranquil music continues]
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00:16:22,189 --> 00:16:25,609
Much can be communicated
through body language and touch.
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A flipper rub reassures,
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like holding hands.
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[dolphin clicks]
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00:16:35,369 --> 00:16:39,373
But some things
can only be said with sound.
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[dolphin squeaks]
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His mom repeats a unique call.
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00:16:45,045 --> 00:16:45,963
[dolphin squeaks]
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00:16:48,799 --> 00:16:50,300
Her signature whistle.
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[dolphin squeaks]
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00:16:53,429 --> 00:16:55,764
It helps him to find her in a crowd.
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[dolphin squeaks]
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And once he's learned to copy it,
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he can call her by her name.
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[dolphin squeaks]
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00:17:08,027 --> 00:17:11,572
Now it's time to experiment
with a whistle of his own.
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[high-pitched squeak]
205
00:17:13,365 --> 00:17:14,450
[high-pitched squeak]
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00:17:16,452 --> 00:17:17,745
Like children,
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dolphins take years learning to speak.
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And once they start talking…
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[squeaking]
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…they never let up.
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[dolphin clicks]
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00:17:38,223 --> 00:17:42,186
But a dolphin's sonic skills
go way beyond words.
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00:17:42,728 --> 00:17:44,730
[tense music plays]
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00:17:48,108 --> 00:17:51,904
The local bottlenose
are searching for food on the sea floor.
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00:17:52,446 --> 00:17:53,989
[squeaking]
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00:17:54,073 --> 00:17:56,033
There doesn't appear to be much here.
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00:17:57,826 --> 00:18:01,997
But they can see things we can't.
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[tense music continues]
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00:18:09,338 --> 00:18:12,424
They fire a stream of high-pitched clicks.
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Five hundred per second.
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[dolphins clicking]
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00:18:24,645 --> 00:18:26,647
And interpret the echoes
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00:18:26,730 --> 00:18:29,566
to pinpoint fish hiding in the sand.
224
00:18:31,485 --> 00:18:38,367
[dolphin clicks]
225
00:18:43,664 --> 00:18:50,629
[dolphin clicks]
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00:18:52,381 --> 00:18:55,801
Echolocation is
an extraordinary sixth sense…
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00:18:57,845 --> 00:19:03,142
that allows dolphins to hunt
in the most unlikely of places.
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00:19:15,112 --> 00:19:16,405
A muddy estuary,
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00:19:17,447 --> 00:19:20,033
and the tide is dropping.
230
00:19:21,702 --> 00:19:25,956
Right now, heading inland
could be a risky move.
231
00:19:26,999 --> 00:19:29,001
[tranquil music plays]
232
00:19:38,677 --> 00:19:43,265
But this dolphin knows
the estuary is full of fish.
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00:19:43,348 --> 00:19:45,350
[tranquil music continues]
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00:19:53,901 --> 00:19:55,903
Using echolocation,
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00:19:55,986 --> 00:20:00,616
she can navigate the silty waters
and find her prey.
236
00:20:00,699 --> 00:20:05,370
[dolphin clicks]
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00:20:05,454 --> 00:20:07,456
[tranquil music continues]
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00:20:08,665 --> 00:20:10,250
Only problem is,
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00:20:10,334 --> 00:20:13,295
at low tide they hide in the oyster beds.
240
00:20:15,214 --> 00:20:18,300
Charging in would shred
her sensitive skin.
241
00:20:20,761 --> 00:20:25,098
Somehow, she needs
to get the fish into the open.
242
00:20:30,145 --> 00:20:32,147
[tense music plays]
243
00:20:38,820 --> 00:20:42,741
Pumping her tail,
she flushes them out of hiding
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00:20:43,825 --> 00:20:47,246
and towards the sandy banks,
where it's safe to strike.
245
00:20:47,329 --> 00:20:49,331
[tense music continues]
246
00:20:51,959 --> 00:20:54,002
[tense music crescendos]
247
00:20:55,712 --> 00:20:58,840
Only a few dolphins
have learned to hunt like this.
248
00:21:03,679 --> 00:21:05,764
And the technique only works
249
00:21:05,847 --> 00:21:08,058
for a few hours each day.
250
00:21:14,731 --> 00:21:17,317
When the tide begins to rise,
251
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the fish disperse.
252
00:21:19,403 --> 00:21:21,405
[hopeful music plays]
253
00:21:22,698 --> 00:21:24,616
A new strategy is needed.
254
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She joins forces with friends
255
00:21:31,999 --> 00:21:35,460
and together they head
towards wider channels.
256
00:21:35,544 --> 00:21:37,546
[hopeful music continues]
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00:21:39,506 --> 00:21:40,507
Then,
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00:21:42,384 --> 00:21:43,593
they wait.
259
00:21:53,103 --> 00:21:54,855
[dramatic music plays]
260
00:21:58,692 --> 00:22:00,944
[birds squawk]
261
00:22:01,028 --> 00:22:03,030
[dramatic music continues]
262
00:22:10,996 --> 00:22:13,040
[dolphins squeak]
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00:22:13,123 --> 00:22:14,666
[dramatic music continues]
264
00:22:18,754 --> 00:22:20,756
[dramatic music fades]
265
00:22:28,013 --> 00:22:30,223
Each time a shoal swims past,
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00:22:30,307 --> 00:22:32,184
the dolphins attack,
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00:22:33,852 --> 00:22:36,980
creating bow waves
that wash the fish ashore.
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00:22:37,564 --> 00:22:39,733
[dramatic music plays]
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00:22:54,581 --> 00:22:58,335
Through echolocation and coordination,
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00:22:58,418 --> 00:23:01,505
they conjure a feast from the mud.
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00:23:04,466 --> 00:23:06,468
[dramatic music fades]
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00:23:08,261 --> 00:23:10,263
Out in the big blue,
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00:23:10,347 --> 00:23:13,767
dolphins must push
their super senses to the limits.
274
00:23:18,647 --> 00:23:21,024
[tranquil music plays]
275
00:23:21,108 --> 00:23:22,984
The challenge of hunting in the abyss
276
00:23:23,068 --> 00:23:27,781
has created one of the most
extraordinary dolphins of all.
277
00:23:27,864 --> 00:23:29,866
[tranquil music continues]
278
00:23:33,954 --> 00:23:37,958
[dolphin squeaks]
279
00:23:38,041 --> 00:23:40,419
[tranquil music continues]
280
00:23:48,468 --> 00:23:51,054
Pilot whales may look strange,
281
00:23:51,763 --> 00:23:55,892
but their bulbous foreheads
hold the secret to their success.
282
00:23:57,144 --> 00:24:01,231
They project long-range sonic beams
hundreds of feet.
283
00:24:02,274 --> 00:24:05,777
The most powerful echolocation
of any dolphin.
284
00:24:07,028 --> 00:24:09,030
[tranquil music continues]
285
00:24:10,240 --> 00:24:12,993
[dolphins click]
286
00:24:13,702 --> 00:24:16,830
It enables pilot whales
to hunt shoals of squid
287
00:24:16,913 --> 00:24:19,040
over half a mile down.
288
00:24:19,875 --> 00:24:24,546
[dolphins click and squeak]
289
00:24:24,629 --> 00:24:26,631
[tranquil music continues]
290
00:24:29,426 --> 00:24:33,138
But young calves can't hold their breath
long enough to follow.
291
00:24:37,517 --> 00:24:40,645
So the family take turns
292
00:24:40,729 --> 00:24:42,689
babysitting at the surface.
293
00:24:44,065 --> 00:24:45,859
[tranquil music continues]
294
00:24:45,942 --> 00:24:48,653
Grandma is over 50 years old.
295
00:24:49,988 --> 00:24:53,325
But she still produces milk
to keep the youngsters fed.
296
00:25:02,417 --> 00:25:05,879
These dolphins live up to 70 years
297
00:25:06,880 --> 00:25:09,174
and stay with the family for life.
298
00:25:10,050 --> 00:25:14,971
Possibly the longest,
most loyal bonds of any animal.
299
00:25:15,639 --> 00:25:21,186
[dolphins squeak]
300
00:25:22,437 --> 00:25:24,606
When the hunting party surfaces,
301
00:25:24,689 --> 00:25:26,691
it's clear they've had success.
302
00:25:32,781 --> 00:25:34,366
Time to move on.
303
00:25:35,742 --> 00:25:38,870
Grandma has a mental map
of their ocean home.
304
00:25:39,996 --> 00:25:43,792
She listens for the sounds
of waves crashing on islands
305
00:25:43,875 --> 00:25:46,545
and currents washing around sea mouths.
306
00:25:49,548 --> 00:25:52,342
Acoustic landmarks revealing the route.
307
00:25:53,552 --> 00:25:55,554
[tranquil music plays]
308
00:25:59,349 --> 00:26:00,559
But sometimes,
309
00:26:01,810 --> 00:26:04,312
even these great navigators
lose their way.
310
00:26:08,275 --> 00:26:09,693
[somber music plays]
311
00:26:09,776 --> 00:26:10,652
Every year,
312
00:26:11,653 --> 00:26:15,282
hundreds of dolphins
strand on beaches around the world.
313
00:26:16,241 --> 00:26:18,785
Pilot whales more often than most.
314
00:26:20,954 --> 00:26:23,915
It only takes one or two to go off course…
315
00:26:26,001 --> 00:26:29,546
and family members
feel compelled to swim to their side.
316
00:26:30,839 --> 00:26:33,049
[somber music continues]
317
00:26:33,133 --> 00:26:36,261
Sometimes, their distress calls
bring hundreds more.
318
00:26:36,344 --> 00:26:39,723
[dolphins squeak]
319
00:26:44,436 --> 00:26:46,354
Natural disasters,
320
00:26:46,438 --> 00:26:48,815
noise pollution, and ill health
321
00:26:48,898 --> 00:26:51,067
all seem to play a part.
322
00:26:53,570 --> 00:26:57,198
But the exact triggers for these events
are poorly understood.
323
00:26:57,282 --> 00:26:59,284
[somber music continues]
324
00:27:04,623 --> 00:27:08,126
People do all they can
to keep stranded whales alive
325
00:27:08,209 --> 00:27:10,920
and try to help them back out to sea.
326
00:27:11,004 --> 00:27:12,881
[somber music continues]
327
00:27:20,430 --> 00:27:23,975
The connection between humans
and dolphins runs deep.
328
00:27:25,685 --> 00:27:30,106
We share a thrill-seeking side
found in few other animals.
329
00:27:31,232 --> 00:27:36,237
And we express ourselves in ways
that have no obvious role in survival.
330
00:27:36,321 --> 00:27:38,323
[dramatic music plays]
331
00:27:41,034 --> 00:27:43,828
But it seems
there's purpose to all this play.
332
00:27:46,289 --> 00:27:48,667
It produces a rush of hormones
333
00:27:48,750 --> 00:27:51,920
that create feelings
of confidence and joy.
334
00:27:53,630 --> 00:27:56,883
Playing together heightens these emotions…
335
00:27:59,052 --> 00:28:03,014
encouraging teamwork
and time spent with friends.
336
00:28:03,098 --> 00:28:05,934
[exhilarating music plays]
337
00:28:17,070 --> 00:28:20,365
Perhaps this is why dolphins
seek the company of others.
338
00:28:20,448 --> 00:28:22,867
[exhilarating music continues]
339
00:28:34,754 --> 00:28:36,881
Playing with their own kind.
340
00:28:36,965 --> 00:28:40,009
[exhilarating music continues]
341
00:28:41,720 --> 00:28:42,554
With us.
342
00:28:46,558 --> 00:28:48,560
And with other animals.
343
00:28:49,269 --> 00:28:51,271
[exhilarating music continues]
344
00:29:08,580 --> 00:29:09,998
[exhilarating music fades]
345
00:29:15,336 --> 00:29:18,256
Dolphins are famous
for their friendly nature.
346
00:29:20,425 --> 00:29:22,844
But they also have a darker side.
347
00:29:36,608 --> 00:29:39,944
When the ocean's top predators go hunting,
348
00:29:40,028 --> 00:29:42,071
nothing is safe.
349
00:29:42,906 --> 00:29:44,824
[dolphins squeaking]
350
00:29:53,958 --> 00:29:55,960
[ominous music plays]
351
00:30:01,591 --> 00:30:04,177
Southern right whales.
352
00:30:06,304 --> 00:30:08,556
Up to 80 tons.
353
00:30:08,640 --> 00:30:09,974
[whale trumpets]
354
00:30:10,058 --> 00:30:12,852
Ten times heavier than an orca.
355
00:30:17,565 --> 00:30:18,733
[whale trumpets]
356
00:30:21,319 --> 00:30:23,112
But working as a team,
357
00:30:24,072 --> 00:30:26,741
orca are almost unstoppable.
358
00:30:32,038 --> 00:30:34,457
The right whales make for the shallows
359
00:30:34,541 --> 00:30:36,543
to avoid attack from below.
360
00:30:36,626 --> 00:30:38,628
[tense music plays]
361
00:30:40,880 --> 00:30:43,758
But orca don't give up easily.
362
00:30:43,842 --> 00:30:45,969
[tense music continues]
363
00:30:48,012 --> 00:30:49,848
Taking turns,
364
00:30:49,931 --> 00:30:52,851
they smash into the whales' flanks,
365
00:30:52,934 --> 00:30:54,644
hitting them where it hurts.
366
00:30:55,895 --> 00:30:57,397
[tense music continues]
367
00:31:05,029 --> 00:31:07,073
The whales strike back.
368
00:31:07,156 --> 00:31:08,366
[squeaking]
369
00:31:08,449 --> 00:31:10,785
[tense music continues]
370
00:31:10,869 --> 00:31:12,078
[whale trumpets]
371
00:31:16,666 --> 00:31:18,042
[tense music crescendos]
372
00:31:18,126 --> 00:31:19,544
[squeaking]
373
00:31:20,461 --> 00:31:21,546
[whale trumpets]
374
00:31:21,629 --> 00:31:23,548
[tense music resumes]
375
00:31:35,018 --> 00:31:39,147
But it's only when the sounds of struggle
attract more right whales
376
00:31:40,690 --> 00:31:43,693
that the orca finally back off.
377
00:31:46,029 --> 00:31:48,031
[tense music fades]
378
00:31:50,533 --> 00:31:53,286
Orca's ability to take on such large prey
379
00:31:53,369 --> 00:31:55,914
earned them the nickname "whale killers,"
380
00:31:56,581 --> 00:31:57,415
or
381
00:31:58,166 --> 00:31:59,375
"killer whales."
382
00:32:02,879 --> 00:32:05,298
Dolphins are not just ruthless hunters.
383
00:32:06,591 --> 00:32:10,178
They can also be
surprisingly aggressive to each other.
384
00:32:21,814 --> 00:32:24,275
[tranquil music plays]
385
00:32:24,359 --> 00:32:25,610
By six years old,
386
00:32:26,194 --> 00:32:28,154
this young spotted dolphin
387
00:32:28,237 --> 00:32:31,366
has finally developed his trademark spots.
388
00:32:31,449 --> 00:32:33,451
[tranquil music continues]
389
00:32:37,330 --> 00:32:38,998
He's seeing less of Mom…
390
00:32:41,042 --> 00:32:44,253
and spending more time
hanging out with friends.
391
00:32:48,841 --> 00:32:52,512
Building alliances is crucial
in these early years.
392
00:32:52,595 --> 00:32:53,638
[dolphin clicks]
393
00:32:54,889 --> 00:32:56,891
[tranquil music continues]
394
00:33:02,730 --> 00:33:06,567
Dolphins form more numerous,
more intense relationships
395
00:33:06,651 --> 00:33:09,821
than any other animal except us.
396
00:33:09,904 --> 00:33:11,906
[tranquil music continues]
397
00:33:14,951 --> 00:33:18,162
As he matures,
life will become more complicated.
398
00:33:18,246 --> 00:33:22,000
[dolphins click and squeak]
399
00:33:22,083 --> 00:33:24,585
And he'll need all the friends he can get.
400
00:33:28,172 --> 00:33:30,174
[tranquil music fades]
401
00:33:36,723 --> 00:33:40,309
A community of bottlenose dolphins
in Western Australia
402
00:33:40,393 --> 00:33:45,314
is considered the most sophisticated
dolphin society of all.
403
00:33:48,276 --> 00:33:50,945
Two thousand live in this one bay.
404
00:33:51,654 --> 00:33:53,656
[upbeat music plays]
405
00:34:02,081 --> 00:34:04,208
During the breeding season,
406
00:34:04,292 --> 00:34:07,670
who you know
becomes more important than ever.
407
00:34:09,714 --> 00:34:11,632
Males that are able to team up
408
00:34:11,716 --> 00:34:13,968
have more chance of winning a mate.
409
00:34:14,052 --> 00:34:15,970
[upbeat music continues]
410
00:34:28,316 --> 00:34:31,194
This trio hangs out
on the east side of the bay.
411
00:34:31,277 --> 00:34:34,155
[upbeat music continues]
412
00:34:37,492 --> 00:34:41,496
They've been best friends for 20 years.
413
00:34:42,705 --> 00:34:44,707
[upbeat music fades]
414
00:34:44,791 --> 00:34:49,253
Swimming in sync
shows just how tight they are.
415
00:34:51,714 --> 00:34:55,802
And choreographed moves
help impress the opposite sex.
416
00:34:56,469 --> 00:34:58,471
[jaunty music plays]
417
00:35:02,892 --> 00:35:04,602
There's the crossover.
418
00:35:07,230 --> 00:35:08,439
The butterfly.
419
00:35:12,068 --> 00:35:13,903
The duo tail touch.
420
00:35:16,114 --> 00:35:17,949
Synchronous dives.
421
00:35:20,118 --> 00:35:21,494
Dual leaps.
422
00:35:22,954 --> 00:35:24,539
Tango moves.
423
00:35:25,206 --> 00:35:29,001
And the inverse rooster strut.
424
00:35:32,213 --> 00:35:35,967
The slicker the routine,
the more attractive they seem.
425
00:35:36,050 --> 00:35:38,052
[jaunty music continues]
426
00:35:41,514 --> 00:35:42,765
Even so,
427
00:35:42,849 --> 00:35:45,518
it often takes days to win over a female.
428
00:35:51,649 --> 00:35:54,360
And now they have competition.
429
00:35:56,487 --> 00:35:57,864
On the west side,
430
00:35:57,947 --> 00:36:00,074
rival gangs are forming.
431
00:36:00,158 --> 00:36:02,451
[tense music plays]
432
00:36:03,369 --> 00:36:05,663
The east side trio needs backup.
433
00:36:08,958 --> 00:36:11,752
So they call on a wider circle of friends.
434
00:36:11,836 --> 00:36:14,172
[tense music continues]
435
00:36:31,397 --> 00:36:33,191
Weaker gangs usually back down.
436
00:36:35,568 --> 00:36:37,945
But when the sides are equally matched,
437
00:36:39,322 --> 00:36:41,782
fights can cause serious injury.
438
00:36:45,953 --> 00:36:47,955
[tense music plays]
439
00:36:51,334 --> 00:36:53,336
[tense music intensifies]
440
00:37:27,828 --> 00:37:29,956
[tense music fades]
441
00:37:30,039 --> 00:37:31,040
An hour later,
442
00:37:32,124 --> 00:37:33,334
it's all over.
443
00:37:38,256 --> 00:37:41,550
Through strong allegiances
and tight teamwork,
444
00:37:41,634 --> 00:37:44,178
the east side friends emerge victorious
445
00:37:44,804 --> 00:37:48,599
and win the chance
to father the next generation.
446
00:37:48,683 --> 00:37:50,685
[tranquil music plays]
447
00:37:52,770 --> 00:37:54,897
Intelligence and collaboration
448
00:37:54,981 --> 00:37:58,943
have enabled dolphins
to navigate life in the ocean.
449
00:38:01,362 --> 00:38:03,781
But their home is changing fast.
450
00:38:06,826 --> 00:38:08,494
[dolphins click]
451
00:38:08,577 --> 00:38:12,248
Even these adaptable animals
are struggling to cope.
452
00:38:15,001 --> 00:38:16,168
[boat horn blares]
453
00:38:18,587 --> 00:38:20,673
Our seas are becoming noisier.
454
00:38:20,756 --> 00:38:22,008
[boat horn blares]
455
00:38:22,800 --> 00:38:23,676
Warmer.
456
00:38:25,428 --> 00:38:26,804
And more polluted.
457
00:38:34,270 --> 00:38:35,896
Instead of seaweed,
458
00:38:35,980 --> 00:38:39,108
many dolphins now play with plastic bags.
459
00:38:49,618 --> 00:38:55,291
Swallowing trash kills over
100,000 marine mammals every year.
460
00:38:56,334 --> 00:38:58,586
And chemical contamination
461
00:38:58,669 --> 00:39:01,339
threatens their ability to reproduce.
462
00:39:04,675 --> 00:39:09,305
But industrial-scale fishing
is the biggest problem dolphins face…
463
00:39:11,974 --> 00:39:14,393
rapidly depleting their vital food
464
00:39:15,019 --> 00:39:19,190
and drowning hundreds
of thousands of them each year.
465
00:39:19,273 --> 00:39:21,275
[somber music plays]
466
00:39:28,240 --> 00:39:31,369
However, even small changes in our actions
467
00:39:31,452 --> 00:39:33,704
can make a big difference.
468
00:39:35,164 --> 00:39:37,166
[upbeat music plays]
469
00:39:47,385 --> 00:39:49,303
When fishermen trawl for shrimp…
470
00:39:52,056 --> 00:39:54,558
other animals are caught in their nets.
471
00:39:57,061 --> 00:40:00,564
But these fishermen
now incorporate special openings
472
00:40:00,648 --> 00:40:02,858
so larger animals can escape.
473
00:40:06,153 --> 00:40:09,365
And the local bottlenose
have learned to seek them out,
474
00:40:10,825 --> 00:40:14,745
using the exit holes
to pick out a prize of fish.
475
00:40:15,246 --> 00:40:18,040
[upbeat music continues]
476
00:40:31,429 --> 00:40:34,598
Entering these death traps
is a risky maneuver.
477
00:40:38,769 --> 00:40:41,689
But these hungry dolphins
take their chances.
478
00:40:43,399 --> 00:40:46,444
[upbeat music continues]
479
00:40:56,495 --> 00:40:58,289
And the fishermen tolerate them.
480
00:41:01,208 --> 00:41:03,043
There's no loss to their catch.
481
00:41:06,380 --> 00:41:08,382
[upbeat music fades]
482
00:41:08,466 --> 00:41:11,218
We still have a lot to learn
about dolphins.
483
00:41:12,011 --> 00:41:15,389
And while some species
are on the brink of extinction,
484
00:41:17,057 --> 00:41:20,311
new ones are still being found.
485
00:41:20,394 --> 00:41:22,396
[jaunty music plays]
486
00:41:26,650 --> 00:41:31,906
It's long been thought there were five
species of river dolphin in the world.
487
00:41:31,989 --> 00:41:35,242
Now biologists believe
they've discovered a sixth.
488
00:41:37,328 --> 00:41:42,500
Only around 1,000 Araguaian river dolphins
are thought to exist.
489
00:41:42,583 --> 00:41:45,294
[jaunty music continues]
490
00:41:46,253 --> 00:41:48,005
But every day
491
00:41:48,088 --> 00:41:50,341
in this Brazilian town,
492
00:41:50,424 --> 00:41:52,760
a small number come to hang out.
493
00:41:54,887 --> 00:41:58,432
The local children can hardly wait.
494
00:42:03,687 --> 00:42:08,108
It's easy to understand
their affinity with these magical animals.
495
00:42:12,696 --> 00:42:16,992
Humans and dolphins
may inhabit very different worlds…
496
00:42:19,495 --> 00:42:22,998
but there's much in our nature
that we share.
497
00:42:23,999 --> 00:42:26,001
[uplifting music plays]
498
00:42:30,089 --> 00:42:32,800
A deep connection to be cherished
499
00:42:33,676 --> 00:42:36,470
for generations to come.
500
00:42:36,554 --> 00:42:39,723
[uplifting music continues]
501
00:42:44,937 --> 00:42:46,939
[uplifting music fades]
502
00:42:48,190 --> 00:42:49,984
[dramatic music plays]